IES/LDT Reader utility enables you to r
ead and convert IES and LDT formatted intensity data files into LightTools
angular apodization files.
An Illuminating Engineering Society (.ies) file contains intensity data according to the LM-63-1991 format for photometric data.
An LDT file (.ldt) contains intensity data according to the EULUMDAT format for the Exchange of Luminaire Data. Both file formats include descriptive information about the measurement and intensity data for a range of horizontal and vertical angles.